Responders need to be able to see the numbers quickly, clearly, and definitively to expedite their response. Also, remember that your address may be used as a reference point for responders to find the appropriate address they are responding to, even if it is not yours.

A helpful way of thinking about posting your address in a visible manner would be, picturing an ambulance trying to find your house at night when it is snowing. What would they be looking for?